Alloy



V Patented Dec. 1, 1942 ALLOY Cecil Spencer Sivil, Roselle, N. J assignor to Baker & Company, Inc., Newark, N. J a corporation of New Jersey No Drawing. Original application December 20,

1941, Serial No. 423,793. Divided and this application June 9, 1942, Serial No. 446,383

(Cl. 75-l72) 3 Claims.

This invention relates to alloys and is concerned in particular with platinum metal alloys.

It is one object of my invention to provide alloys of great corrosion resistance, high melting point and great hardness and strength. It is another object of my invention to provide such alloys of great electrical resistance. It is a further object of my invention to provide such alloys of low specific gravity and low cost.

This application is a division of my applica- 1.1 in accordance with this invention have higher tion Serial No. 423,793, filed December 20, 1941, melting point, greater hardness, higher tensile which in turn is a continuation in part of my strength and higher electrical resistance than application Serial No. 401,653, filed July 9, 1941, the alloys described and claimed in my aforewhich in turn is a continuation in part of my apsaid application Serial No. 423,793. plication Serial No. 378,376, filed February 11, In its best embodiments the alloys consist en- 1941. tirely of palladium, ruthenium, irridum, and

In my aforesaiad, co-pending application No. rhodium in the proportions specified herein, al- 423,793 I have described alloys of 60% to about though, of course, minor quantities of other met- 95% palladium, 0.5% to 20% ruthenium, and als may be present so long as they do not sub- 2.5% to 39.5% iridium. The alloys according 20 stantially affect the beneficial properties and to this invention comprise palladium, ruthenium, characteristics of my alloys. iridium, and rhodium. In such alloys the pal- What I claim is: ladium content may be as low as about 60% and 1. An alloy of palladium, ruthenium, iridium, as high as about 94.5%, the ruthenium content and rhodium, comprising 60% to 94.5% palladimay be as low as 0.5% and as high as about 25 um, 0.5% to 20% ruthenium, 2.5% to 37% 20%, the iridium content ranging from about iridium, and 2.5% to 37% rhodium. 2.5% to about 37%, and the rhodium content, 2. An alloy of palladium, ruthenium, iridium, likewise, ranging from about 2.5% to about 37%. and rhodium, comprising 80% to 94.5% palladi- I prefer alloys wherein the ruthenium content um, 1% to 10% ruthenium, 2.5% to 10% iridilies between about 1% and a maximum content 39 um, and 2.5% to 10% rhodium. of about 10%. Particularly advantageous are 3. An alloy of palladium, ruthenium, iridium, alloys within the limits of 80% to 94.5% paland rhodium, comprising about 80% palladium, ladium, 1% to 10% ruthenium, 2.5% to 10% about 5% ruthenium, about 5% iridium, and iridium, and 2.5% to 10% rhodium, such as alloys about 10% rhodium. of 80% palladium 5% ruthenium 5% iridium 35 and 10% rhodium, or of 90% palladium 2.5% ruthenium 2.5% iridium and 5% rhodium.

In orderto illustrate the properties of the alloys according to this invention, I may state that an alloy of 80% palladium 5% ruthenium 10% rhodium and 5% iridium has a tensile strength of 133,900 lbs. per square inch when hard, and of 94,200 lbs. per square inch when annealed, and an elongation of 27% on 2-inches when annealed. The alloy, likewise, possesses an electrical resistivity of 200 ohms/mil. ft. The alloys CECIL SPENCER SIVIL. 

